<?php
/**
 *--------------------------------------------------------------------
 *
 * Sub-Class - UPC-A
 *
 * UPC-A contains
 *	- 2 system digits (1 not provided, a 0 is added automatically)
 *	- 5 manufacturer code digits
 *	- 5 product digits
 *	- 1 checksum digit
 *
 * The checksum is always displayed.
 *
 *--------------------------------------------------------------------
 * Copyright (C) Jean-Sebastien Goupil
 * http://www.barcodephp.com
 */
include_once('BCGean13.barcode.php');

class BCGupca extends BCGean13 {
	protected $labelRight = null;

	/**
	 * Constructor.
	 */
	public function __construct() {
		parent::__construct();
	}

	/**
	 * Draws the barcode.
	 *
	 * @param resource $im
	 */
	public function draw($im) {
		// The following code is exactly the same as EAN13. We just add a 0 in front of the code !
		$this->text = '0' . $this->text; // We will remove it at the end... don't worry

		parent::draw($im);

		// We remove the 0 in front, as we said :)
		$this->text = substr($this->text, 1);
	}

	/**
	 * Draws the extended bars on the image.
	 *
	 * @param resource $im
	 * @param int $plus
	 */
	protected function drawExtendedBars($im, $plus) {
		$temp_text = $this->text . $this->keys[$this->checksumValue];
		$rememberX = $this->positionX;
		$rememberH = $this->thickness;

		// We increase the bars
		// First 2 Bars
		$this->thickness = $this->thickness + intval($plus / $this->scale);
		$this->positionX = 0;
		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
		$this->positionX += 2;
		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);

		// Attemping to increase the 2 following bars
		$this->positionX += 1;
		$code1 = $this->positionX;
		$temp_value = $this->findCode($temp_text[1]);
		$this->drawChar($im, $temp_value, false);

		// Center Guard Bar
		$this->positionX += 36;
		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
		$this->positionX += 2;
		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);

		// Attemping to increase the 2 last bars
		$this->positionX += 37;
		$temp_value = $this->findCode($temp_text[12]);
		$this->drawChar($im, $temp_value, true);

		// Completly last bars
		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);
		$this->positionX += 2;
		$this->drawSingleBar($im, BCGBarcode::COLOR_FG);

		$this->positionX = $rememberX;
		$this->thickness = $rememberH;
	}

	/**
	 * Adds the default label.
	 */
	protected function addDefaultLabel() {
		if ($this->isDefaultEanLabelEnabled()) {
			$this->processChecksum();
			$label = $this->getLabel();
			$font = $this->font;

			$this->labelLeft = new BCGLabel(substr($label, 0, 1), $font, BCGLabel::POSITION_LEFT, BCGLabel::ALIGN_BOTTOM);
			$labelLeftDimension = $this->labelLeft->getDimension();
			$this->labelLeft->setSpacing(8);
			$this->labelLeft->setOffset($labelLeftDimension[1] / 2);

			$this->labelCenter1 = new BCGLabel(substr($label, 1, 5), $font, BCGLabel::POSITION_BOTTOM, BCGLabel::ALIGN_LEFT);
			$labelCenter1Dimension = $this->labelCenter1->getDimension();
			$this->labelCenter1->setOffset(($this->scale * 44 - $labelCenter1Dimension[0]) / 2 + $this->scale * 6);

			$this->labelCenter2 = new BCGLabel(substr($label, 6, 5), $font, BCGLabel::POSITION_BOTTOM, BCGLabel::ALIGN_LEFT);
			$labelCenter2Dimension = $this->labelCenter2->getDimension();
			$this->labelCenter2->setOffset(($this->scale * 44 - $labelCenter1Dimension[0]) / 2 + $this->scale * 45);

			$this->labelRight = new BCGLabel($this->keys[$this->checksumValue], $font, BCGLabel::POSITION_RIGHT, BCGLabel::ALIGN_BOTTOM);
			$labelRightDimension = $this->labelRight->getDimension();
			$this->labelRight->setSpacing(8);
			$this->labelRight->setOffset($labelRightDimension[1] / 2);
			

			$this->addLabel($this->labelLeft);
			$this->addLabel($this->labelCenter1);
			$this->addLabel($this->labelCenter2);
			$this->addLabel($this->labelRight);
		}
	}

	/**
	 * Check correct length.
	 */
	protected function checkCorrectLength() {
		// If we have 12 chars, just flush the last one without throwing anything
		$c = strlen($this->text);
		if ($c === 12) {
			$this->text = substr($this->text, 0, 11);
		} elseif ($c !== 11) {
			throw new BCGParseException('upca', 'Must contain 11 digits, the 12th digit is automatically added.');
		}
	}
}
?>